The plugin can be used free of charge, in commercial or non-commercial applications. The source code is available under a Creative Commons Attribution license.

In a nutshell, this means you are free to use the software and its source code in your projects. If you use the source code in another software project, you are required to add attribution to the author(s). You are encouraged to share the your source code under a similar fashion, but it is not a requirement.

If you use the plugins regularly, you may consider making a donation so I can afford to continue making these plugins and making them available.